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The land area of Montgomery County, MD was 491 in 2018. The land area of Fairfax County, VA was 391 in 2018.

Land Area

Water Area

Land area is a measurement providing the size, in square miles, of the land portions of geographic entities for which the Census Bureau tabulates and disseminates data. Area is calculated from the specific boundary recorded for each entity in the Census Bureau's geographic database. Land area is based on current information in the TIGER® data base, calculated for use with Census 2010.

Water Area figures include inland, coastal, Great Lakes, and territorial sea water. Inland water consists of any lake, reservoir, pond, or similar body of water that is recorded in the Census Bureau's geographic database. It also includes any river, creek, canal, stream, or similar feature that is recorded in that database as a two- dimensional feature (rather than as a single line). The portions of the oceans and related large embayments (such as Chesapeake Bay and Puget Sound), the Gulf of Mexico, and the Caribbean Sea that belong to the United States and its territories are classified as coastal and territorial waters; the Great Lakes are treated as a separate water entity. Rivers and bays that empty into these bodies of water are treated as inland water from the point beyond which they are narrower than 1 nautical mile across. Identification of land and inland, coastal, territorial, and Great Lakes waters is for data presentation purposes only and does not necessarily reflect their legal definitions.

Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API - Notes:

1. ODN datasets and APIs are subject to change and may differ in format from the original source data in order to provide a user-friendly experience on this site.

2. To build your own apps using this data, see the ODN Dataset and API links.

3. If you use this derived data in an app, we ask that you provide a link somewhere in your applications to the Open Data Network with a citation that states: "Data for this application was provided by the Open Data Network" where "Open Data Network" links to http://opendatanetwork.com. Where an application has a region specific module, we ask that you add an additional line that states: "Data about REGIONX was provided by the Open Data Network." where REGIONX is an HREF with a name for a geographical region like "Seattle, WA" and the link points to this page URL, e.g. http://opendatanetwork.com/region/1600000US5363000/Seattle_WA

Geographic and Area Datasets Involving Fairfax County, VA or Montgomery County, MD

  • API

    MC311 Service Requests

    data.montgomerycountymd.gov | Last Updated 2024-05-31T05:17:55.000Z

    Information on all MC311 Service Requests received (via email or phone) since July 1, 2012. This data is updated daily. The PIO’s business requirement includes adding the following data elements to the new and enhanced open data site being proposed by DTS. This data is derived from requests for service which originate in the CSC, from the County’s web portal, and via “walk-ins” from county departments including but not limited to DHCA. • SLA – to indicate the number of days in county business days the department has to fulfill the request. County business days must exclude weekends, county holidays and days when the county is closed due to inclement weather (snow days, etc) per CountyStat’s business requirement. This field has been published in the existing MC311 Service Requests dataset with the field name ‘Attached Solution SLA Days’. • +/- SLA –to indicate the number of days a service request is over or under SLA as is currently measured by CountyStat. The following 4 fields will be added to fulfill this line item  # of days open – Number of County Business days the Service Request has been opened.  Within SLA Window? - To indicate the number of days a service request is over or under SLA as is currently measured by CountyStat.  SLA Yes – Number of days to fulfill the service request is under the SLA window.  SLA No -– Number of days to fulfill the service request is over the SLA window.

  • API

    Crash Reporting - Incidents Data

    data.montgomerycountymd.gov | Last Updated 2024-02-09T06:41:14.000Z

    This dataset provides general information about each collision and details of all traffic collisions occurring on county and local roadways within Montgomery County, as collected via the Automated Crash Reporting System (ACRS) of the Maryland State Police, and reported by the Montgomery County Police, Gaithersburg Police, Rockville Police, or the Maryland-National Capital Park Police. Please note that these collision reports are based on preliminary information supplied to the Police Department by the reporting parties. Therefore, the collision data available on this web page may reflect: -Information not yet verified by further investigation -Information that may include verified and unverified collision data -Preliminary collision classifications may be changed at a later date based upon further investigation -Information may include mechanical or human error This dataset can be joined with the other 2 Crash Reporting datasets (see URLs below) by the State Report Number. * Crash Reporting - Drivers Data at https://data.montgomerycountymd.gov/Public-Safety/Crash-Reporting-Drivers-Data/mmzv-x632 * Crash Reporting - Non-Motorists Data at https://data.montgomerycountymd.gov/Public-Safety/Crash-Reporting-Non-Motorists-Data/n7fk-dce5 Update Frequency : Weekly

  • API

    Crime

    data.montgomerycountymd.gov | Last Updated 2024-05-30T07:35:42.000Z

    Updated daily postings on Montgomery County’s open data website, dataMontgomery, provide the public with direct access to crime statistic databases - including raw data and search functions – of reported County crime. The data presented is derived from reported crimes classified according to the National Incident-Based Reporting System (NIBRS) of the Criminal Justice Information Services (CJIS) Division Uniform Crime Reporting (UCR) Program and documented by approved police incident reports. The data is compiled by “EJustice”, a respected law enforcement records-management system used by the Montgomery County Police Department and many other law enforcement agencies. To protect victims’ privacy, no names or other personal information are released. All data is refreshed on a quarterly basis to reflect any changes in status due to on-going police investigation. dataMontgomery allows the public to query the Montgomery County Police Department's database of founded crime. The information contained herein includes all founded crimes reported after July 1st 2016 and entered to-date utilizing Uniform Crime Reporting (UCR) rules. Please note that under UCR rules multiple offenses may appear as part of a single founded reported incident, and each offense may have multiple victims. Please note that these crime reports are based on preliminary information supplied to the Police Department by the reporting parties. Therefore, the crime data available on this web page may reflect: -Information not yet verified by further investigation -Information that may include attempted and reported crime -Preliminary crime classifications that may be changed at a later date based upon further investigation -Information that may include mechanical or human error -Arrest information [Note: all arrested persons are presumed innocent until proven guilty in a court of law.] Update Frequency: Daily

  • API

    Floodplain Study

    data.montgomerycountymd.gov | Last Updated 2024-05-01T09:45:20.000Z

    The purpose of a floodplain study is to establish the 100-year floodplain limits within or near a development in order to preserve the natural resources within the 100-year floodplain, to protect property and persons, and to apply a unified, comprehensive approach to floodplain management. Update Frequency - Daily

  • API

    Crash Reporting - Drivers Data

    data.montgomerycountymd.gov | Last Updated 2024-02-09T06:46:16.000Z

    This dataset provides information on motor vehicle operators (drivers) involved in traffic collisions occurring on county and local roadways. The dataset reports details of all traffic collisions occurring on county and local roadways within Montgomery County, as collected via the Automated Crash Reporting System (ACRS) of the Maryland State Police, and reported by the Montgomery County Police, Gaithersburg Police, Rockville Police, or the Maryland-National Capital Park Police. This dataset shows each collision data recorded and the drivers involved. Please note that these collision reports are based on preliminary information supplied to the Police Department by the reporting parties. Therefore, the collision data available on this web page may reflect: -Information not yet verified by further investigation -Information that may include verified and unverified collision data -Preliminary collision classifications may be changed at a later date based upon further investigation -Information may include mechanical or human error This dataset can be joined with the other 2 Crash Reporting datasets (see URLs below) by the State Report Number. * Crash Reporting - Incidents Data at https://data.montgomerycountymd.gov/Public-Safety/Crash-Reporting-Incidents-Data/bhju-22kf * Crash Reporting - Non-Motorists Data at https://data.montgomerycountymd.gov/Public-Safety/Crash-Reporting-Non-Motorists-Data/n7fk-dce5 Update Frequency : Weekly

  • API

    Floodplain District Permit

    data.montgomerycountymd.gov | Last Updated 2024-05-30T09:53:35.000Z

    The purpose of a Floodplain District Permit (FPDP) is to control floodplain development in order to protect persons and property from danger and destruction and to preserve environmental quality. Floodplain district: Any area specified in Executive regulations that is subject to inundation in a 100-year storm. This includes any waterway with a drainage area of 30 acres or larger. Floodplain district permit: A permit issued by the Department under this article authorizing land-disturbing and construction activities. Floodplain district permit plan: A set of representational drawings or other documents submitted by an applicant to obtain a floodplain district permit that contains the information and specifications the Department requires minimizing the safety hazards of or the negative hydraulic and environmental impacts associated with development in or near a floodplain." Update Frequency : Daily

  • API

    County Well Permits

    data.montgomerycountymd.gov | Last Updated 2024-05-30T07:17:52.000Z

    This dataset contains data for Well Permit. A Well Permit must be obtained prior to drilling a well for any purpose including to provide potable drinking water, water for irrigation or agricultural purposes, monitoring of geothermal systems and dewatering. Update Frequency : Daily

  • API

    Soils Testing Process

    data.montgomerycountymd.gov | Last Updated 2024-05-15T07:55:35.000Z

    All properties are either served by public sewer or a private septic system as its means of wastewater disposal. Properties that are ineligible for public sewer service must complete satisfactory water table tests and percolation or sand mound testing to establish a sewage disposal area on the property before it can be considered 'buildable'. Update Frequency : Daily

  • API

    Norfolk 2020 American Community Survey Five-Year Estimates

    data.norfolk.gov | Last Updated 2022-06-08T18:43:17.000Z

    This dataset contains the American Community Survey (ACS) five-year estimates for Norfolk, Virginia. According to the United States Census Bureau, the ACS is the premier source for detailed population and housing information about communities and the nation. Every year, the Census Bureau conducts a survey and creates estimates for demographic categories such as income, employment, poverty, race, ethnicity, housing, age, gender, internet access, vehicle access, and other topics. For census tracts, 5-year estimates are generated and released to the public. This dataset includes five-year estimates released in 2020 for census tracts in Norfolk, VA and will be updated annually with each new release of five-year estimates.